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Acquisitions And Other Investments (Freewest Purchase Price Allocation) (Details) (USD $) In Millions	Dec. 31, 2010	Mar. 31, 2010 Scenario, Previously Reported [Member] Freewest [Member]	Mar. 31, 2010 Freewest [Member]	Dec. 31, 2009 Freewest [Member]
Equity instruments (4.2 million Cliffs common shares)		$ 173.1
Cash		12.8
Fair value of Cliffs' equity interest in acquiree held prior to acquisition of remaining interest				27.4
Total net assets acquired	$ (1.7)		$ 185.9

The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

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- Definition

This element represents the sum of the: (1) acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer and (2) the acquisition-date fair value of any equity interest in the acquiree held by the acquirer prior to the business combination (for example, a step acquisition).

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